w3 Qnt561 dq

new due in 2 hours minimum 60 words each with reference

chp6

1. What is the difference between one-sample t-test and 2-sample t-test?  give some concrete examples

chp10

2.What are the common mistakes in survey design? How can we avoid those mistakes? Please give concrete examples.

chp10

3. It is a common practice for survey designers to include "neutral" in the scale. For example,

Do you agree that Obama care is a good policy? Rate this statement using a 5-point Likert scale:

1= strong disagree   2 = disagree   3=neutral   4=agree  5=strongly agree

•Peter, Paul, and Mary chose "3".

•Peter's position: "I am not sure. There are both pros and cons in this policy."

•Paul's position: "I already have my own insurance. I don't care."

•Mary's position: "I am a new immigrant. I don't know what Obamacare is. No idea!"

Are these "neutral" answers the same? If not, what number(s) should you assign to their positions? How would you rewrite the options (If necessary)?